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Yokoyama N, Ohta H, Yamazaki J, Kagawa Y, Ichii O, Khoirun N, Morita T, Osuga T, Lim SY, Sasaki N, Morishita K, Nakamura K, Takiguchi M. Localization of Toll-like Receptor (TLR) 2 and TLR4 mRNA in the Colorectal Mucosa of Miniature Dachshunds with Inflammatory Colorectal Polyps. J Comp Pathol 2017; 156:183-190. [PMID: 28089357 DOI: 10.1016/j.jcpa.2016.10.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Revised: 09/30/2016] [Accepted: 10/22/2016] [Indexed: 01/03/2023]
Abstract
Inflammatory colorectal polyps (ICRPs) are characterized by the formation of multiple or solitary polyps with marked neutrophil infiltration in the colorectal area, and are speculated to be a novel form of breed-specific canine idiopathic inflammatory bowel disease (IBD). In human IBD, toll-like receptor (TLR) 2 and TLR4 have been reported to be involved in the pathogenesis of the disease. The aim of this study was to evaluate the expression of TLR2 and TLR4 mRNA in the colorectal mucosa of dogs with ICRPs by in-situ hybridization using an RNAscope assay. Samples of inflamed colorectal mucosa (n = 5) and non-inflamed mucosa (n = 5) from miniature dachshunds (MDs) with ICRPs and colonic mucosa from healthy beagles (n = 5) were examined. TLR2 and TLR4 hybridization signals were localized to the colorectal epithelium, inflammatory cells and fibroblasts in the inflamed colorectal mucosa of affected dogs. The signals were significantly greater in inflamed colorectal epithelium compared with non-inflamed epithelium of MDs with ICRPs and healthy beagles (P <0.05). These results suggest that increased expression of TLR2 and TLR4 mRNA in the inflamed colorectal mucosa results from not only inflammatory cell infiltration, but also the upregulation of TLR2 and TLR4 mRNA in the colonic epithelium.
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Affiliation(s)
- N Yokoyama
- Laboratory of Veterinary Internal Medicine, Department of Veterinary Clinical Sciences, Sapporo, Japan
| | - H Ohta
- Laboratory of Veterinary Internal Medicine, Department of Veterinary Clinical Sciences, Sapporo, Japan
| | - J Yamazaki
- Laboratory of Molecular Medicine, Department of Veterinary Clinical Sciences, Sapporo, Japan
| | - Y Kagawa
- Department of Diagnostic Pathology, Sapporo, Japan
| | - O Ichii
- Laboratory of Anatomy, Department of Biomedical Science, Sapporo, Japan
| | - N Khoirun
- Laboratory of Veterinary Internal Medicine, Department of Veterinary Clinical Sciences, Sapporo, Japan
| | - T Morita
- Laboratory of Veterinary Internal Medicine, Department of Veterinary Clinical Sciences, Sapporo, Japan
| | - T Osuga
- Laboratory of Veterinary Internal Medicine, Department of Veterinary Clinical Sciences, Sapporo, Japan
| | - S Y Lim
- Laboratory of Veterinary Internal Medicine, Department of Veterinary Clinical Sciences, Sapporo, Japan
| | - N Sasaki
- Laboratory of Veterinary Internal Medicine, Department of Veterinary Clinical Sciences, Sapporo, Japan
| | - K Morishita
- Veterinary Teaching Hospital, Department of Veterinary Clinical Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| | - K Nakamura
- Veterinary Teaching Hospital, Department of Veterinary Clinical Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| | - M Takiguchi
- Laboratory of Veterinary Internal Medicine, Department of Veterinary Clinical Sciences, Sapporo, Japan.
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